Experiment 2 - biochemical changes on postharvest in fruits and vegetables Flashcards
major componsent in most fruits and vegetables
water
major factor affecting quality of fruits and vegetables
water loss or transpiration
Effects of water loss to fruits and vegetables
wilting
shriveling
flacidness
soft texture
loss of nutritional value
predominant energy sources for cells
carbohydrates
carbohydrates representes what when an edible plant tissue is removed from the parent plant
carbohydrates represent tbe reserves necessary to maintain cellular function
primary cell wall
a thin, flexible, and extensible layer formed while the cell is growing
secondary cell wall
forms as a thick layer inside the primary cell wall after the cell is fully grown
middle lamella
forms at the interface between adjacent plant cells; promotes cell-to-cell adhesion
cellulose
linear polymer of beta-1,4-linked beta glucose residues deposited in the wall to form microfibrils
hemicellulose
branched and are mainly composed of several neutral sugars like xylose
pectins
linear or branched polymers that are rich in galacturonic acid and dispersed throughout the primary cell wall
Happens due to the loosening of the hemicellulose-cellulose network, solubilization and depolymerization of pectin and loss of pectic side chains
cell-wall swelling
formula for percent calcium pectate
%CP = (g of precipitate/g of sample in aliqout)*100%
what are the three types of carbohydrates
structural
soluble
storage
carbohydrates used in metabolic processes such as glycolysis and secondary metabolic pathways
soluble carbohydrates